An annotated checklist of oribatid mite taxa from acacia and pine plantations of Dong Nai Culture and Nature Reserve (Southern Vietnam) is presented. The species Ctenacarus araneola, Nehypochthonius porosus,Scheloribates mahunkai, Scheloribates kraepelini, Indoribates panabokkei, genera Ctenacarus,Nehypochthonius and families Ctenacaridae and Nehypochthoniidae are first records from Vietnam, and of these Nehypochthoniidae, Nehypochthonius and Nehypochthonius porosus are first records from the Oriental region. A new oribatid mite species, Galumna (Cosmogalumna) dongnaiensis sp. nov. (Galumnidae), is described from soil in a pine plantation. The new species is distinguishable from all species of the subgenus Galumna (Cosmogalumna) by the sculpturing of the prodorsum and pteromorphs and the number of notogastral porose areas.